What was found
ON PREFLIGHT INSP, APPLIED A +/- 5 LB UP AND DOWN FORCE ON RT STABILIZER TIP, HEARD A GRUNTING SOUND. FURTHER INVESTIGATION REVEALED A SMALL RELATIVE MOTION BETWEEN STABILIZER AFT FITTING, 0432005-2, AND FUSELAGE. REMOVING NUT OPENED A 0.020 INCH AIR GAP BETWEEN FITTING AND FUSELAGE. CLEANING GAP WITH A CLOTH DIDN’T SHOW ANY METAL PARTICLES. THE FIX WAS TO FABRICATE A 0.020 INCH SHIM. THIS FITTING IS A VERY RIGID CHANNEL SUCH THAT IF THERE WAS AN AIR GAP IT MAY NOT CLAMP ON TO THE FUSELAGE FITTING HARD ENOUGH WITH BOLT TORQUE. THIS MAY NOT BE A DEFECTIVE PART, JUST TOLERANCE STACK UP. LEFT SIDE FITTING WAS CHECKED. IT REQUIRED A 0.010 INCH SHIM. THESE 2 AFT MNT POINTS ARE LOAD CYCLED MORE FREQUENTLY.